This week’s Thrift Store Find is Superman: Miracle Monday, written by Elliot S. Maggin and published by Warner Books in 1981.
Cover price was $2.50, I got it for a quarter.
This is the second in a series of paperback novels Warner Books published, presumably in conjunction with their Superman franchise of movies starring Christopher Reeve. Superman II was released in theaters in 1980; presumably this book was in bookstores to capitalize on that film.